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Microbial-enrichment method enables high-throughput metagenomic characterization from host-rich samples.

Natalie J Wu-Woods1, Jacob T Barlow1, Florian Trigodet2

  • 1Biology and Bioengineering, California Institute of Technology, Pasadena, CA, USA.

Nature Methods
|October 12, 2023
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Summary

A new microbial enrichment method (MEM) effectively reduces host DNA in tissue samples, enabling detailed analysis of the gut microbiome. This technique allows for deeper insights into host-microbe interactions and microbial community structures.

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Area of Science:

  • Microbiology
  • Genomics
  • Host-Microbe Interactions

Background:

  • Host-microbe interactions are crucial for health and disease, often studied via 16S rRNA sequencing.
  • Studying microbial genomes in host tissues is challenging due to high host DNA ratios.
  • Mechanistic insights into host-microbe interactions are limited by current methodologies.

Purpose of the Study:

  • To introduce and validate a microbial enrichment method (MEM) for analyzing host-associated microbial communities.
  • To overcome the challenge of high host DNA contamination in tissue samples.
  • To enable high-throughput characterization of microbial metagenomes from host tissues.

Main Methods:

  • Development and application of a microbial enrichment method (MEM).
  • Demonstration of MEM on diverse sample types including saliva, stool, and intestinal biopsies.
  • Shotgun sequencing of MEM-treated samples for metagenomic analysis.

Main Results:

  • MEM reduced host DNA by over 1,000-fold in human intestinal biopsies with minimal impact on microbial communities.
  • Enabled characterization of both high- and low-abundance microbial taxa, pathways, and genes.
  • Facilitated the construction of metagenome-assembled genomes from bacteria and archaea at 1% abundance.

Conclusions:

  • MEM significantly enhances the ability to study host-tissue-associated microbial communities.
  • The method allows for deeper characterization of microbial populations, including distinct subpopulations.
  • MEM provides a pathway for acquiring deeper insights into host-microbe interactions.